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Flatline 4500 Questions

SO, I just bought a Flatline 4.5k that is currently attached to an in-hydro 72/45 PMI tank. The seller says it needs a rebuild though, and included a rebuild kit.

I however have NO idea how to go about rebuilding it... Do i need to remove it from the tank? how would i go about doing that? How similar is the process to the 3k rebuild here: MCB 3k Flatline Rebuild

The guide on mcarter brown is great, also there is a sticky in the maintenance section that covers it, too. They are very similar to the 3000 psi units. Did the seller include a new reg seat or seal? It the red washer looking thing with a tapered hole in one side? if not, good luck finding one, thy dont make then anymore.

he said: "The Flatline needs a rebuild (rebuild kit with a new valve seat will be included , just not pictured)." So, I'm hoping that covers anything I would need. Seriously nobody fabricates these privately? that surprises me.

dumb question due to this quote. I also have a 4500 flatline. If they don't make this part anymore. Doesn't that basically make the whole valve bad if that seal goes out? And inherently junk since a replacement can't be bought?

I don't know the right answer to that question, however, I have a 4500 and I have used a reg seat from a classic valve on mine, I know that's no the right thing to do, but mine has been working without leaks up to about 1100 psi. Definitely not a permanent fix, but it has got me through a pinch until I can find a suitable replacement. And I'm warning now,I dont condone using this method, but if you do, do so at your own risk. And if anyone comes across any, please share the weath!

I don't know the right answer to that question, however, I have a 4500 and I have used a reg seat from a classic valve on mine, I know that's no the right thing to do, but mine has been working without leaks up to about 1100 psi. Definitely not a permanent fix, but it has got me through a pinch until I can find a suitable replacement. And I'm warning now,I dont condone using this method, but if you do, do so at your own risk. And if anyone comes across any, please share the weath!

It's been working for a couple weeks, I can't go much above 1000 psi or it will start to vent thru the adjustment hole. Currently I'm looking at alternative washers. Hopefully I can find something that will work.

It's been working for a couple weeks, I can't go much above 1000 psi or it will start to vent thru the adjustment hole. Currently I'm looking at alternative washers. Hopefully I can find something that will work.

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if you do, post it up here. I had another idea though, maybe a custom run of these from an overseas manufacturer? It would have to be done in BULK, but could be doable through the power of AO/MCB. lol.

if you do, post it up here. I had another idea though, maybe a custom run of these from an overseas manufacturer? It would have to be done in BULK, but could be doable through the power of AO/MCB. lol.

Hey Tyler, if you want to try using classic valve seats, I'm pretty sure I have a couple extra kicking around I can throw in with the parts kit. It would save you the hassle of making an extra order and also possibly save you from potentially wasting probably the last 4.5k flatline valve seat in existence, lol.

As far as reproducing these, I would give this company a shot : http://www.marcorubber.com/orings.htm . I've bulk ordered standard o-rings from them in the past and they do custum runs of non standard o-rings. Despite their web page being outdated, I do believe they are still in business .